- Enrollment
- 812
- Students per teacher
- 12.1:1
- Resource Index
- 49/100
Middle school (grades 6-8) · Arlington Heights, IL
Thomas Middle School
Federal NCES profile for Thomas Middle School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 48/100.
2024-25 NCES dataMiddle school (grades 6-8)NCES 170414000106
👥 S:T ratio 43
🌟 Gifted program 30
📋 Attendance 71
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Thomas Middle School earns 48/100 on the Resource Investment Index, with class sizes near the Illinois median.
- #8 of 13
- public schools in Arlington Heights · Resource Index
- 48
- Resource Index · Typical
- 14.2:1
- students per teacher
- 1,024
- students enrolled
Thomas Middle School has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Thomas Middle School ranks #8 of 13 public schools in Arlington Heights, IL.
School address
District: Arlington Heights Sd 25 · Illinois
NCES ID 170414000106 Verify on NCES CCD record →
NCES CCD universe card
School universe 170414000106 · Arlington Heights, IL Middle · MID · TRAD
1,024 enr · 14.2:1 · RII 48
Nearest enrollment peer: South Middle School (812 students)
Resource Investment Index #8 of 13 public schools in Arlington Heights. NCES Common Core of Data stamps for this campus. Read with this school → · District book → · Illinois schools → · Find another →
Thomas Middle School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- This school
Thomas Middle School
1,024 students
- South Middle S
South Middle School
812 students
- Olive-Mary Sti
Olive-Mary Stitt School
671 students
- Westgate Elem
Westgate Elem School
633 students
- Ivy Hill Elem
Ivy Hill Elem School
593 students
- Dryden Elem Sc
Dryden Elem School
521 students
What this shows Thomas Middle School reports 1,024 students on the CCD universe file.
How Thomas Middle School compares
Thomas Middle School on the metrics families compare, against Illinois and U.S. means.
| Metric | This school | vs Illinois | Illinois avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 14.2:1 | ▲ 1% | 14:1 | 15.7:1 |
| Enrollment | 1,024 | top 7% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
14.2:1
Leaner classes than 55% of US schools, a middle-of-the-pack class size.
1,024
Bigger than 92% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Staffing depth
14.2:1
students per teacher
- 1% above state mean
Top 60% in Illinois - lower ratio than 40% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
11.7%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$18,806
per pupil, district-wide
- above Illinois avg of $18,196
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
19
in-school suspensions + 5 out-of-school
Suspension rate: 1.9 per 100 students. Combined in-school and out-of-school rate: 2.3 per 100 students. Reported via the Civil Rights Data Collection. Includes 1 expulsion.
Student demographics
White 70.5%
Asian 17.0%
Hispanic or Latino 9.2%
African American 1.6%
Native Hawaiian / Pacific Islander 1.0%
Two or More 0.6%
American Indian / Alaska Native 0.2%
Largest group: White at 70.5% of enrollment.
Student-body diversity index 46.5/100
Simpson diversity index - at 46.5, Thomas Middle School is more mixed than the Illinois school average of 38.9.
Programs
Funding & spending
District-wide per-pupil expenditure for Arlington Heights Sd 25, which includes Thomas Middle School.
$18,806
Per student
+3%
vs Illinois
Avg $18,196
+7%
vs U.S.
Avg $17,658
Revenue mix
Local 69.9%
State 24.8%
Federal 5.3%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2022-23 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Thomas Middle School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| South Middle School | Similar size | No free-lunch data | Lower S:T ratio |
| Olive-Mary Stitt School | Smaller | No free-lunch data | Higher S:T ratio |
| Westgate Elem School | Smaller | No free-lunch data | Similar S:T ratio |
| Ivy Hill Elem School | Smaller | No free-lunch data | Higher S:T ratio |
| Dryden Elem School | Smaller | No free-lunch data | Higher S:T ratio |
Comparisons are relative to Thomas Middle School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 671
- Students per teacher
- 16.4:1
- Resource Index
- 48/100
- Enrollment
- 633
- Students per teacher
- 13.5:1
- Resource Index
- 52/100
- Enrollment
- 593
- Students per teacher
- 16.5:1
- Resource Index
- 41/100
- Enrollment
- 521
- Students per teacher
- 16.3:1
- Resource Index
- 48/100
Similar middle schools in Arlington Heights
1 comparable middle schools (grades 6-8) serving the same city.
Nationwide middle schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~1,024 students)
Frequently asked questions about Thomas Middle School
How many students attend Thomas Middle School?
Thomas Middle School has 1,024 students enrolled. It is a middle school in Arlington Heights, IL.
What is the student-teacher ratio at Thomas Middle School?
The student-teacher ratio at Thomas Middle School is 14.2:1, which is 1% higher than the Illinois average of 14:1 and 10% lower than the national average of 15.7:1.
What is the racial and ethnic makeup of Thomas Middle School?
The largest demographic group at Thomas Middle School is White at 70.5% of enrollment, in Arlington Heights, IL.
What is the Resource Investment Index for Thomas Middle School?
Thomas Middle School has a Resource Investment Index of 48/100 (typical reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, gifted-program reporting, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Thomas Middle School rank among public schools in Arlington Heights?
By Resource Investment Index, Thomas Middle School ranks #8 of 13 public schools in Arlington Heights, IL. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Arlington Heights on the city page.
What other schools are in Arlington Heights Sd 25?
Besides Thomas Middle School, Arlington Heights Sd 25 also operates South Middle School (812 students), Olive-Mary Stitt School (671 students), and Westgate Elem School (633 students). See the Arlington Heights Sd 25 district page for the complete list.
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error. Data current as of August 2026.